You have to read more times a text to understand:

• Message

  You have to the recognize the writer's message, that is what the writer will communicate about a specific topic in his text

• Stylistic Chooses

  You have to explain with which textual elements you recognized the message and with which ones you wants to support your opinion

Drafting and redrafting is useful to check:

• Grammar and Syntax
  

  You have to explain your analysis in a good English

• Type of language
  You have to consider the type of reader that will read your analysis